Kiln



F. PEITER.

KILN.

APPLICATION FILED DEc.4,191s.

1,434,023, Patented oet. 31,1922.

2 SHEETS-SHEET l.

I4 gli 4% a Zvw/ATTORNEYS F. PEITER.

KILN.

APPLICATION FILED DEC. 4, I919 1,434,023 Patented Oct. 31, 1922,

2 SHEETS-SHEET 2.

ATTO R N EYS Patented @et 3l, EZ..

UNIT@ earner FREDERICK PEITER, OF BROOKLYN, NEW YORK, ASSIGNOR T0 ROBERTSAYRE KENT,

INC., OF BROOKLYN, NEW YORK, A. CORPORATION 0F NEW' YORK. l

Kinn.

Application filed December 4, 1519. Serial No. 342,458.`

marked thereon, which forma part of this specification lThe presentinvention refers, generally, to improvements in drying revivifying anddecarbonizing kilns; and the invention relates, more particularly, to animproved construction of rotary kiln and means for heating the same.

The invention has for its principal object to provide in combinationwith a rotary kiln a novel construction and arrangement of lire box andcombustion chamber designed to produce a more even heating of thekilndrum, and to prevent the` application of too intense heat againstthesurface of the kiln drum tending to burn throughr the shell so as to`require frequent and expensive repairs and replacements thereof.

Other objects of the present invention, not at this time moreparticularly enumerated, will be clearly understood from the followingdetailed description of thesame.

The invention isclearly illustrated in the accompanying drawings, inwhich Figure l is a longitudinal vertical section of a. rotary kiln,made according to and embodying the principles of the present invention,the kiln drum being illustrated in side elevation.

Figure 2 a vertical cross-section of the Same, taken on line 2 2 in saidFigure l, said view being drawn on an enlarged scale,

Similar characters of reference are employed in all of the hereinabovedescribed views, to indicate corresponding parts.

Revolving of rotary kilns, of the type with which the present inventionis concerned, are commonly employed to roast or bake bone-black,fuller"s` earth and various' other substances that require acomparatively moderate heat, generally about 1100 degrees F.,

distributed in the enclosing chamber in which the kiln drum revolves.lThese kilns,

as heretofore constructed, have the lire box communicate directly ywiththe enclosing chamber in which the kiln drum is mounted, thus exposing aconsiderable portion of the surface of the steelshell comprising thekiln drum to the fire so that the or portion of the heat of the fuel bedis directly communicated to said shell by radiation. It thereforefollows that the exposed portion of the drum shell is subjected toa moreintense heat, at such point,than is desirable for the best treatment vofthe material to be baked or roasted, and also this intense heat,directly radiated against the exposed portion of the drum shell,fhas adeleterious effect upon the shell, burning the same through, and therebyrendering `expensive repairs and replacements more frequently necessarythan is the case with the improved construction of kiln made accordingto the principles of the present invention. 4

Referring now tothe accompanying drawings, the improved construction ofrotary or revolving kiln embodying the principles of my presentinvention, comprises a suitable housing l, usually built of brick, theconstruction of which is re-enforcel by suitably disposed `buckstaves 2.The upper` portion of the interior of the housing provides a drumchamber 3, through which extends the kiln drum 4. rlhe kiln drumcomprises a cylindrical hollow steel shell, provided at each end withjournals 5, which are mounted in bearings 6 .carried by suitablyarranged brackets 7 connected with the opposite exterior ends of thehousing' l. @ne of said journals 5 is provided with a sprocket wheel8,01"k other suitable rotating means through which a rotary impulse maybe imparted to the ydrum by means of transmission mechanism (not shown)driven from any desired source 'of power.

The axis of the drumis inclined downwardly from its receiving end towardits discharge end, so as' to permit a traveling movement through thedrum of material delivered thereto for treatment.

ln my novel construction and arrangement of kiln, the fire-box 9 islocated within the lower part of the housing l beneath and adjacent tothe discharge end of the drum 4i, said fire box containing the fuelsupporting grate 10 beneath which is an ash-pit 11. One wall of thehousing l is provided with openings leading respectively into thelirebox and ash pit, said openings being fitted respectively with thelire-box door l2 and ash pit door 1B. Extending forwardly from saidfircboX 9 and beneath said drum chamber 3 is a combustion chamber 14,the same being separated from said drum chamber 3 by a transverse archpartition l5. Located at the forward end portion of said housing,beneath the receiving end of' said drum 4 is port 16 which affordscommunication between the combustion chamber 14C and the forward end ofvthe drum chamber 3. Mounted in connection with said housing l, and incommunication with the rear end of said drunichainber 3 is a flue orstack i7.

ln the novel construction and arrangement of kiln as above described,the fuel for generating heat is burned upon the grate l() within thefire-box 9. From the lire-box 9 the products of combustion'resultingfrom the burning fuel; pass forwardly through thev combustion chamberlli, from thence passing' through the port 16 into the drum chamber 3,wherein the same surround the drum d, passing" rearwardly through thecombustion chamber 3 to finally escape from the rear end of the latterthrough the flue or stack 17. The advantages of the constructionl andmethod of vheat conduction involved are; rst, the shell. of the kilndrum is notez;- posed to the fire, thatl is to direct radiation of heatfrom the burning fuel; second, the long combustion chamber through whichthe products of combustion must pass, before gaining entrance into thekiln chamber 3, assures perfect combustion, allows time for saidproducts of combustion to thoroughly iutermingle, thus tending toproduce an even temperature; and, third, some heat contacting with thearch or partition passes therethrough and is radiated from the uppersurface thereof into the drum chamber to the kiln drum, and isconsequently abstracted from the products of combustion before thelatter enter through the port 16 into the drum chamber therebyreducing'their temperature at the point where they rst come in contactwith the drum shell, and tending to produce, as they pass through thedrum chamber, incombination with the heat radiated through the arch orpartition, a more nearly equalized.temperature condition throughout theinterior of the drum Lchamber7 and a temperaturer of the desiredcomparatively low degree.

l am aware that some changes may be made in the construction of kilnabove described and as illustrated in the drawings, while stillretaining the general principles of my invention. Hence I do not limitmy invention to the exact arrangements. and

construction of parts, as described in the foregoing specication, nor dol conhne myself to the exact details ofthe construction of the variousparts as illustrated in the accompanying drawings.

l. In a rotary7 kiln, a main housing providing a drumr chamber in* itsupper portion, a kiln drum mounted to extend through and rotate in saiddrum chamber, a tire-box in the lower portion of said housing' beneaththe discharge end of said kiln drum, a conr bustion chamber extendingforwardly from said fire-box through the lower portion of said housing',a horizontal partition memberseparating said lire-box and combustionchamber from said drum chamber, said partition member having a portbeneath the re'- ceiving end of said kiln drum aording communicationbetween the forward ends of said combustion chamber and said drumchamber. 1

2. In a rotary kiln, a main housing having` a longitudinally disposeddrum chamber in its upper par-t, a kiln drum mounted to extend throughand rotate in said' drum chamber,-the receiving end of said kiln drumbeing disposed at the forward end of said drum chamber and its dischargeend at the rearwardend of said drum chamber, a stack or fiuecommunicating with the rearward end of said drum chamber, a fire-box inthe lower portion of said housing beneath the rearward end of said drumchamber, a coinbustion chamber extending forwardly and longitudinallyfrom said fire-box through the lower portion of said housing, theforward end of said combustion chamber communicating with the forwardendv of said drinn chamber', and a horizontal partition member arrangedwithin said housing to separa-te said. drum chamber from said firebofrand said combustion chamber.I

In testimony that l claim the 'invention set forth above I have hereuntoset my hand this 19th dav of November, i919..

i FREDERICK BETTER. lVitnesses GEORGE D. RICHARDS, MARION M. BANTA.

